Basic doubt about specifying compiler and MPI

[Praveen C]

Dear all

The documentation says we set compilers like

cmake -DCMAKE_C_COMPILER=my_c_compiler -DCMAKE_CXX_COMPILER=my_cxx_compiler -DCMAKE_Fortran_COMPILER=my_fortran_compiler <…>

Where do I specify which MPI to use ?

Should I specify mpicc, mpic++, mpif90 as compilers ?

I do not see how deal.II cmake picks the location of MPI ?

Thanks
praveen

[blais...@gmail.com]

If you enable MPI (using -DDEAL_II_WITH_MPI) then the cmake output will specify which version of the MPI library you are using.

If you wish to specify in particular a version, you can pass it using additional argument. For example -DMPI_CXX_COMPILER=...

If you wish to see all possible variables you can specify, an easy way is to use ccmake to see all configuration options. You can toggle advanced configuration options to see all variables available to you.

Hope that helps

BB

[Praveen C]

Thanks, is it ok to use

-DCMAKE_CXX_COMPILER=/path/to/mpic++
-DMPI_CXX_COMPILER=/path/to/mpic++

regards
praveen

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[Matthias Maier]

It's generally best to make sure that mpicc, mpic++, mpirun are in PATH
and then enable MPI via -DWITH_MPI=ON.

MM